I dunno about the wear and tear thing with stop-start, you'd think that hear more about starters failing then you do since that was implemented. It became wide spread about 12 years back and has been around since the 1980s.
Personally I get about 20 MPG out of my Bronco, which the best mileage I've gotten out of any of my cars, save the Fusion hybrid (which was an unexpected purchase I only put 3K on) and my old Escort GT. Stop Start I'm sure helps with that.